I wonder if any one can help, I need advise on how to wire a vaillant Ecotec Plus 630 system boiler to a Honeywell Y plan so that the y plan switches the boiler on independantly from the permanent feed for the pump over run? The vaillant wiring diagram shows terminals 4 and 3 on the boiler as linked or remove the link for external controls, but how do you incorporate this into the y plan? I can't work it out any help greatly appreciated.
Vaillant Ecotec Plus 630 Pump Overun
- Thread starter slizer82
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Deleted member 105431
orange from 3port into terminal 4 on pcb (remove red link)
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Vaillant tech. helpline can talk you through it. Instructions for my vaillant system boiler and unistor unvented cylinder install were crap but the techies talked me through the reprogramming and everything is working ok
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